A user interface concept, acronym for Goals, Operators, Methods and Selection rules, a model of efficiency in HCI.

From GOMS Models: An Approach to Rapid Usability Evaluation:

[..] Earlier research in HCI has resulted in a general concept, the GOMS model, which represents the procedural knowledge required to operate a system in terms of the user Goals, basic actions or Operators, Methods, which are sequences of operators that will accomplish goals, and Selection rules, which determine which method to apply to accomplish a goal. [..]

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